this mod modifies the weapon stats to more realistic ones, it is based off of the weapons from GRIM's Weapon Pack Volume III, i started a topic about it on GTA Forums and all of the info is going to be put there the link is below. im probably about 90% done besides the other random odds and ends to tie up,
http://www.gtaforums.com/index.php?act=ST&f=58&t=456771